add XDPLua map sample

Author: VictorNogueiraRio

samples/bpf/Makefile

@@ -173,6 +173,8 @@ always += xdp_sample_pkts_kern.o
 always += ibumad_kern.o
 always += hbm_out_kern.o
 always += hbm_edt_kern.o
+# CONFIG_XDPLUA
+always += xdplua_map_kern.o
 
 KBUILD_HOSTCFLAGS += -I$(objtree)/usr/include
 KBUILD_HOSTCFLAGS += -I$(srctree)/tools/lib/bpf/

samples/bpf/map.lua

@@ -0,0 +1,22 @@
+--
+-- Copyright (C) 2019-2020 Victor Nogueira <victor.nogueira@ring-0.io>
+--
+-- This program is free software; you can redistribute it and/or
+-- modify it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation version 2.
+--
+-- This program is distributed "as is" WITHOUT ANY WARRANTY of any
+-- kind, whether express or implied; without even the implied warranty
+-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+xdp = require'xdp'
+
+function lookup(map)
+	local val = xdp.maplookup(map, 1)
+	print('val', val)
+end
+
+function update(map)
+	xdplua.mapupdate(map, 1, 3)
+end

samples/bpf/xdplua_map_kern.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2019-2020 Victor Nogueira <victor.nogueira@ring-0.io>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#define KBUILD_MODNAME "foo"
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") test_map = {
+	.type		= BPF_MAP_TYPE_ARRAY,
+	.key_size	= sizeof(int),
+	.value_size	= sizeof(int),
+	.max_entries	= 20,
+};
+
+SEC("test_map")
+int xdp_test_map(struct xdp_md *ctx)
+{
+	char lookupname[] = "lookup";
+	char updatename[] = "update";
+
+	bpf_lua_setstate(ctx);
+	bpf_lua_pushmap(ctx, &test_map);
+	bpf_lua_pcall(ctx, updatename, 1, 0);
+
+	bpf_lua_pushmap(ctx, &test_map);
+	bpf_lua_pcall(ctx, lookupname, 1, 0);
+
+	return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";